Reactor



Dec. 22, 1953 L. E. SAUER 2,663,828

REACTOR Filed Nov. 7, 1951 4 Sheets-Sheet l 44* Load Load '42 Fig. 2.

WITNESSES:

Dec. 22, 1953 L. E. SAUER 2,663,828

REACTOR Filed Nov. 7, 1951 4 SheetsSheet 2 WITNESSES: INVENTOR Louis ,1 S'ouer.

Dec. 22, 1953 L. E. SAUER 2,663,828

REACTOR Filed Nov. 7, 1951 4 Sheets-Sheet 3 WITNESSES:

INVENTOR D 22,- 1953 L. E. SAUER 2,663,828

REACTOR Filed Nov. 7, 1951 4 Sheets-Sheet 4 WITNESSES:

Fig 6.

Patented Dec. 22, 1953 REACTOR Louis E. Sauer, Sharon, Pa., assignor to Westinghouse Electric Cor poration, East Pittsburgh, a corporation of Pennsylvania Application November 7, 1951, Serial No. 255,189

Claims.

This invention relates to current limiting reactors and in particular to reinforced current limiti'ng reactors.

When utilizing a T or Pi type current limiting reactor in which the reactor comprises more than one coil section, a problem arises which does not exist when utilizing a reactor comprising a single coil section. For instance, where each coil section of the reactor is associated with a branch feeder and faults occur simultaneously on each of the branch feeders associated with the respective coil sections, a' high magnetic repulsive force is established between two of the coil sections, If the coils are of large diameter are carrying current of large magnitude, the repulsive force will be such as to sheet a complete physical separation of the coil sections.

Heretoiore various methods have been used to prevent the separation of the coil sections when such repulsive forces of large magnitude are encountered, such as expensive clamping means for holding the coil sections in assembled operative relation. These prior art clamping means increased the cost and size of the reactor. Furthe): such clamping means failed to hold the coil sections ri idly in place when a high repulsive force is established therebetween and thus, although the reactor is not completely put out of service, considerable damage is inflicted on the reactor. It is, therefore, desirable to provide some means for preventing the separation of the coil sections which would be inexpensive and would not add to the size of the reactor.

An object of this invention is to provide a current limiting reactor having the coil sections thereof so secured as to prevent the physical sepa'ation of the coil sections when subjected to the iorces encountered in use.

A further object of this invention is to provide, in a current limiting reactor having a pair of coil sections, for securing predetermined corresponding turns of the coil sections, the securing means progressively decreasing in strength from the adjacent corresponding turns of the coil sections to the farthest separated of the predetermined corresponding turns.

A still further obiect of this invention is to provide distributed tape means for so securing the coil sections of a current limiting reactor that the coil sections are prevented from physically separat g when a hi h magnetic repulsive force is established therebetween.

Other objects of this invention will become apparent from the following description when taken in coniunction with the accompanying drawing, in which;

Figure 1 is a schematic diagram of circuits and apparatus embodying a T type current limiting reactor;

Figure 2 is a schematic diagram of circuits and apparatus embodying a Pi type current limiting reactor;

Figure 3 is a view partly in section and partly in elevation taken along the lines III-III of Fig. i illustrating a reactor comprising an embodiment of the teachings of this invention;

Figure 4 is a view in section taken along the lines IV-IV of Figure 3;

Figure 5 is a view partly in section and partly in elevation, corresponding to the View shown in Fig. 3, illustrating a reactor comprising another embodiment of the teachings of this invention, and

Figure 6 is a view partly in section and partly in elevation, corresponding to the view shown in Fig. 3, illustrating a reactor comprising still another embodiment of the teachings of this invention.

Referring to Figure 1 of the drawing, there is schematically illustrated a T type current limiting reactor 50 comprising two coil sections I2 and I3, respectively. The coil sections I2 and I3 are disposed to limit the flow of current from an alternating current generator I6 to two loads I8 and 20. Thus, one terminal of the generator I6 is electrically connected to the common junction point of the coil sections I2 and I3, and the other terminal is connected to the loads l8 and 20, and from thence to the ends of the coil sections I3 and i2, respectively.

When faults occur simultaneously at the points 22 and 24, fault current flows from the generator IS in a direction towards the two faults. The fault current flowing through the coil sections I 2 and I3, if of sufiicient magnitude. effects a high magnetic repulsive force between the coil sections I2 and I3, which is often of suihcient magnitude to cause a physical separation of the coil sections I2 and I3, and thereby permanently damage the current limiting reactor 10, unless the coil sections are secured together as will be described hereinafter.

Figure 2 illustrates a P1 type current limiting reactor 38 which likewise must be provided with some means for preventing damage to the assembly of its coil sections, should a plurality of simultaneous faults occur or should separate faults occur at particular points as will be discussed more fully hereinafter. In this instance the current limiting reactor 30 comprises three coil sections, 32, 34 and 36, the coil sections 36 and 32 being disposed to limit the current flow from alternating current generators 38 and 40, respectively.

One terminal of the generator 38 is connected to the junction point of the coil sections 34 and 36,

and through the coil section 36 to one side of a load 42, the other terminal on the other side of the generator 38 being connected to the other side of the load 62. Likewise, a terminal of the generator lll is connected to the junction point of the coil sections 32 and '34, and through thecoi1 section 32 to one side of a load M, the other terminal of the generator 40 being connected to the: other side of the load 44.

When faults occur simultaneously at the points 46 and ll, fault current flowslrom .thealternating current generators Mand -4E) towards the faults so as to produce a magnetic repulsive-force between the coil sections 36 and 32. If the repulsive force is of sufficient ma'g'nitude'rit*will*effeet a physical separation of the coil sectionsfi-E: and 36, thus permanentlyrdamaging the current limitingreactorfill, unless Ithe .coil sections 32 and 36 are secured together as will be desribedh'ereinafter.

On the other. hand, if a single fault :cceurs' at" the-point 48, fault 'currentfflows froiri'the generators 38 and 30 towards the single'faiilf,ahdthus'- produces amagnetic. repulsive force betweenthe" coil-sections 3 2" a'nd 3tf However' ifa' single fault occurs atthepoint ABL'tfau'IKciirient fieivs'f towards this latter rainifrom-the 'gerieratbrs. as and 40 aridestablishe's a magnetic "repulsive force between'the' coil secucns 3Y4 a'n'd 36. Ii these 'repulsive forces are of-suificieiit' magnitude, they willefiect a physicalseparationofthe'coil sections 32-34'or sn-es; .dpenaingiupcn the location of the'fault,runlessithesecoiYsections are properlysecureda's willbe described Hereinafter.

Referring to Figure-3, therelis illustrated'in'de tail the T type current limitingire'acto'illliof Fig-- ure 1; i which comprises: an"; embodiment; oi the teachingsof this inventl'oh'.-- In this'e'rrilcioditnent; the reactor l ll "comprise'sa'horizontally wound coil 59; which issuitably connected at-itsmidpoint ti')- a terminal 52, s'olas-to form. the upper coilsel h tion [2- andthe lower coilisection I3 However; it is to be understood that'lthe presentinvention is equally applicable to the Pi type' current limit ing reactor 30 as illustrated in Figure Z'aridw'heri' so applied, constitutes other embodiments oi this invention. V

The reactor ill comprises essentially the coil sections lZ aLnd l3 a'ndfa supporting means 53' for normally holding the coil sections 12am l3 in horizontal and vertical spaced-relation when thecurrent limiting reactor IE does" not; have fault current flowing simultaneously through the sections iz and i3I In near to. provide" means for readilyconnectingthe reactor I intdan'e1ectrical cir'cuit;=the upper endotthe coil'section- I? is provided with. a stationary t'ermihalfiil) which is suitably mounted on the side" of the reactor I'll. In use mann' r,. the1owe end of the con section is. is provided withastationary terminalfilkwhich is likewise suitably mounted on theside ofthe reactor Ml. 'Ihecent er-ter'minaII-SZisalsb mounted ontheside ofthe reactor V [IL AsWaTs hereinbefore mentionedathe supporting means ET is provided.-

order' to: hold thecoil sections l2 and Hi in horizontal and vertical spaced relationwhen fault cur-rent does notfiow' simultaneously through the: coil sections I 2 and-'- I3. The supporting means 51' cm'l'iprises a plu rality of layers" of cleat members Bl, formed from an insulating material", disposed to hold the" layers of coil turns. Horizontal Spaced reiauom.

Each layer of cleat members BI is formed of four radially spaced cleat members 6! spaced degrees apart, as can more clearly be seen in Fig. l. The cleat members Bl of each layer are vertically aligned with the corresponding cleat members of the adjacent layers. Also, in order to properly hold in place the turns forming the different layers ofnthe coilisectionslLand 13,: each cleat member/ 6 I 'is. provided with aiplurality of spaced channels 62 for receiving the turns of the coil sections l2 and I3.

It is to be noted that the coil section 12 is disposed in the channels 62 of the upper 2t cleats ofthe reactor l0 byspirally Winding it inwardly 15 alongsthefirstlayeriof cleat members 5i and then spirally=winding iti outwardly along the second from the top layer of cleat members 6| and in like=manneralong the remaining four upper layers-of' cleat members Bl, so as to form three vertical rows of spaced coil turns. The coil sec tion [3 is disposed in thetlower six layers of cleat members .61 by spirallywindinglitinwardly along the'uppermost'layer'oi "the lower six'layers of ra diallyl spaced cleat membersjl, andgthemout= wardly alon'gthe next lower "layer of cleat-members 6 l and-in "likezm'anner along "the remaining furlowerlayerspfcleat members 6!; to form a continuation'of the three: vertical rows of coil turns of the uppercoil sectionl2} As'illustratedj a top'disk member B l-ands botton idiskmemberfifi; both formed of 'an insulating material, .such" as" reinforced concrete, are disposed". on opposite" ends of? the" assembled cleat members 6! which have the coil sections 1 3" disposed thereb'etween as described hereinbefore. In'ordertoholdth'e topydisk member 6 3, thecl'eat member's B l ,thecoil sections l2'and I 3, and the'bottom"diskmemberfiiifinassembled re lation, spacediiexrodsfi8fandassociated nuts 69 are provided? v the tierods 682- extending i throughthe assembledcomponents:

In order to preventther physical separation of the coil sections" l2 and" l 3* when a magnetic repulsive force of large magnitude exists between the"coilisecti'onsi l 2 and I3, tape-means 0 isprovide'd? Theftape meansv mfmay beformed of eithera tape-made fi'om glass fibers; .a linen-tapeimpregnated with varnish; a" tape made from fibers of linear polya'crylonitrilepolymer, or any suitable insulating'material which has-substantialligrio yieldwhen; subjected" to a high tensileforce:

As illustrated; thetapameans it comprises a number of turns oftape'associated with a predetermined numberof'the-layers' of the coil" turns thaticomprise the" coil sections l 2 and I3? In particular, a" plurality-"of turns Tl of tape are disposed around the outer coil turns (2 and 1& of the innermost layers" of *th'e' coil sections l2 and I3: Likewise; similarturn's l loftap'e are disposed about the other corresponding-turns ofthe innermost layers-ofthe-coilsections l2 and I3 These turns'oftape are effective-for preventing a physmar separation of the coil turnsof'the innermost layersof the'coil se'ctions I 2" and I3; should a high magnetic repulsive force be established therebetween. Such turns of tape are intermediate eachpair' or' the radially spaced cleat: members 61,. as can more clearly be' seen. in" Fig. 4. However sihce, for the, purpose; of clarity ofthedrawmg; the coil; turns shown Fig. 4; are illustrated. as being abruptly bentinona quadrature of; the reactorin spirally winding: the coilturns into the channels 62,. the tape: means 10: has notbeen shown: in this quadrature, In practice, these bends would not be so pronounced and tape means It would also be disposed thereon.

In order to prevent the turns H of tape from unraveling, the ends thereof are suitably secured such as by adhering them to the turns H of tape by means of an adhesive. The ends of the turns of tape hereinafter referred to are secured in like manner. It is also to be understood that any suitable flexible tieing means that is composed of an insulating material and has substantially no yield when under high tensile force could be used in place of the turns H of tape or in place of the other turns of tape hereinafter referred to.

As can be seen from the drawing, the number of turns H of tape disposed around the coil turns 72 and 7d of the innermost layers is greater in number than turns 76 of tape disposed around coil turns 18 and 86 of the next layers that appear above and below the coil turns l2 and M, respectively. The reason for this is that the magnetic repulsive force is greater between the coil turns l2 and it than it is between the coil turns 18 and 83 for a given condition. Since the magnetic repulsive force is even smaller for the given condition between coil turns 84 and 8B of the following layers, a still fewer number of turns 88 of tape are disposed around the coil turns 84 and 86. The repulsive force between corresponding coil turns 90 and 92 is still smaller than the repulsive force that exists between the coil turns 84 and 85 for the given condition. Therefore, fewer turns 93 of tape are disposed around the coil turns 99 and 92 than are disposed around the coil turns 84 and 86.

Although the tape means in has only been described as being disposed around the corresponding coil turns 12-14, 78-86, 84-435, and 9ll92, of the upper and lower coil sections [2 and I3, tape is disposed in like manner, as shown in Figures 3 and 4, around the corresponding coil turns that are disposed inwardly of the coil turns 12 1s, 13-80, 84-86 and 90-92.

As illustrated in the drawing, turns of tape are not disposed around the upper and lower two layers of coil turns of the coil sections l2 and [3, respectively, since the magnetic force that exists therebetween for the given condition is attrac tive rather than repulsive. It is to be understood, however, that the number of layers of coil turns that do not have tape disposed thereon depends on many factors such as the rating of the reactor and the number of coil turns disposed thereon.

Referring to Fig. 5, there is illustrated another embodiment of the teachings of this invention. In this embodiment, the present invention is applied to the Pi type reactor prevent the physical separation of the coil sections 32 and should simultaneous faults occur at the points and 4?. In order to simplify the description of the reactor primed reference characters corresponding to the reference characters of Fig. 3 are used to identify components corresponding to like components of the embodiment shown in Fig. 3. For instance, the various coil turns and turns of tape are given primed reference characters since they have substantially the same function nd cooperation with one another as the like components in the embodi ment of the reactor Ill, shown in Fig. 3. In this instance, however, the turns H, 16', t3 and 93' of tape are much longer than the corresponding turns ll, 16, S8 and 33 of tape shown in Fig. 3, since they must be long enough so as to extend across the coil section 34 in the vertical direction.

As can be seen from the drawing, the reactor to of Fig. 2, so as to 30 of Fig. 5 comprises the coil sections 32, 34 and 36, the centrally positioned coil section 34 comprising four layers of coil turns having no turns of tape disposed thereon since when fault current flows through the coil sections 32 and 36 when faults occur simultaneously at the points 46 and 41 substantially no current flows through the coil section 34. Thus, there is substantially no magnetic force set up between the coil sec tion 34 and the end coil sections 32 and as when such a condition exists, therefore rendering it unnecessary to provide means for preventing the physical separation of the intermediate coil section 34 from the end coil sections 32 and 35. Although the coil turns of the coil section 34 have no tape associated therewith, they are disposed in the channels 62 of the cleat members 61, as are the coil turns of the other coil sections.

In order to provide means for readily connecting the reactor 33 into an electrical circuit, the upper end of the coil section 32 is provided with a stationary terminal Hi0 which is mounted on the side of the reactor 30. In like manner, the lower end of the coil section 36 is provided with a stationary terminal I62 which is likewise suitably mounted on the side of the reactor 3%. A terminal I04 is suitably connected to the junction point of the coil sections 32 and 34 and a terminal 496 is suitably connected to the junction point of the coil sections 34 and 5B, the terminals [E54 and tilt being suitably mounted on the side of the reactor 3! Referring to Fig. 6, there is illustrated still another embodiment of the teachings of this invention. In this embodiment the present invention is appiied to the Pi type reactor at of Fig. 2, so as to prevent the physical separation of the coil sections 32-44 or ti l-35, should fau ts 0cour at the points 48 or 49, respectively. In order to simplify the description of the reactor iden tical reference characters are used to identify components corresponding to like components of the embodiment shown in Fig. 5.

In the embodiment shown in 6, the reactor 353 comprises essentially the coil sections 3 and 33, which are suitably connected at the junction point of the sections 32 and 34" and the junction point of the sections 34' and 3G to terminals Hi3 and 509, respectively. Supporting means H6 is provided for normally holding the coil sections 32, 34 and 3B in horizontal and vertical spaced relation with respect to one another when the current limiting reactor 33 does not have fault current flowing the-r rough. In order to provide means for read connecting the reactor 3!? into an eiectrical circuit, the upper end of the coil section 32 is provided with a stationary terminal H2, which is suitably mounted on the side of the reactor In li 1e manner, the lower end of the coil section 3:; is provided with a stationary terminal Ht, which is likewise suitably mounted on the side of the reactor 3 3. The terminals 138 and 16;? are also mounted on the side of the reactor and electrically connected to the and lower end, respectively, of the coil section In this instance, the upper coil section coznprises six layers of coil turns which are d posed in. the uppermost six layers of cl m oers 6|. On the other hen-:1, the intermedia coil section 34 comprises eight layers of coil turns which are disposed in the following eight layers of cleat members 6!; whereas the coil section 38 comprises six layers of coii which are disposed in the lowermost six layers of oleat members 6|. As in the previously described: ember, ments each layer of th e cleat are hers-IE] .jeqj i iir adial-u rat d. cl 1 s'pacedfgfllfdegrees'a artfa'nd' the individual cle'at iriemb rspg of each layer are vertically aligned F with the corresponding cleat members of thefjjadjacent layers,'

in thisembodime'nt; aplnrality of tape means i Iii, similar to the tape means roger Fig 3, is applied to predetermined coil turns of the sections 32 and 3 4. The tape'means ll 18 comprises a nurn ber of turns 1 i8, 'l24, l3fi andl lliiof tape assoi edw iia. tre trm hed n mb of a rs of the coil turns thatfcomprise the coil sections Slandtki, Inpart icular', "a; plurality of turns ll3ofitape arejdisposedaround the outer coil turns we and zzfc'r Jtheadjacent layers oi the coil "sections,fiz andfdj respectively, the coil turns of seanns 32 jand as having been given new reference"characters in Fig. 6:, Likewise, similarfturns l iil o'f tape arefdisposed about the other' corresponding coil turnsotthe' adjacent layers of the coilj'sections Brand 33. These turns areeffective for'p'reyenting a; physical sep aration of the: two adjacent 'lay'ersflof coil turn's oijthe coil sections 32 and 3{l shouldra high magnetic repulsive jforce be jestablished therebetween. Such turns of tape, are disposed intermediate each pair of f'. the radially spaced cleat members i is Ascan be seen from thedrawing, the number of turns i!8 of tape disposed, around the coil turns iii? and E22 ofthe coil sections'BZ and 35', respectively, is greater innumber thantu'rns E24 of'tapedisposedJaround coilfiturns l25 and 525 of the next layers 'thatappear aboveand below the coil turns zsa dl zz, respectively. The reason for this is that the magnetic repulsive force is greater between theucoil turns 1 29 andi Zitloan it 'is between the co'il turns I26 and I23} for a given condition. Since the, magnetic repulsive force is even'smaller for the gi'venfcondition between coil 'turns' and 13 2, of the following layers, a still fewer number of turns i3 i of tape are disposed aroun'dthefcoil turns iSil and I322. The repulsive force between corresponding coil. turns i357 and I38; isfstillsmaller than the repuls'ive force that exists between the coil turns 53?! and 32 for the given condition. Therefore, fewer turns Mal of tape are disposed around the coil, turns H55 and l 38than are disposed around the coil turns I39 and. L33.

Although the tapel'ineans l I 6 has only been described "as being disposed around the corresporiding coil turnsf l 20"I2 2', l26i28, I3Bl32; and ltd-438, of the 'coil"'sections 32 and 34', tape is disposed" in like: manner, as shown in Fig. 6, around the corresponding coil turns that are disposed inwardly of'the coil turns l20l22, l25l28, [M -I32, and I36l38. It is to be understood, howcverf'that the, number of layers of coil turns thatldo not have tape disposed thereon depends on many factors, such'as the rating of the reactor and the number of coil turns disposed thereon.

In order to'prevent the physical. separation of the coil sections 34' and 36 when a magnetic repulsive force of large magnitude exists therebetween, tape means I is provided which may, be formed from the same material as is the tape means H6. As, illustrated, the tape means :50 comprises a number'of. turns" l52,"i58', I68 and I14 of tape, associatedwith apre'determined number of the layers hf the 'coil turns that comprise the coil sections"34"and 36. In particular, a plurality of turns l52 "of'taipe are disposed.

around the outer coil turns [55 and I56 of the two adjacent fcoil'turn layers 0f th e coil sections 3qf and 3fi'. Likewisafsimilar turns 152 of tape are disposed about the other corresponding coil turns offth twoadjacent layers of the coil sections 3.41am 36. These turns of tape are effestive forjpreventing a physical separation of the coilturnsof the two adjacent layers of the coil sections 34' and'36, should a high magneticber of turns 15g of tapeQdisposed around the coil turns I54 and I56 is greater in number than; turns 158 of tape disposed around coilturns ltd and 162 of thenextlayers that appear above and below the coil turns I 5 and L56, respecf" tiv elyfThe reason'for this is that the magnetic repulsive force is'greaterbetween the coil turns l 54andl 56' than it is between the coil'turns I69 and Milton a given condition. Since the magnetic repulsive force is even'smaller for the of the following layers, astill fewer number of turns lfi flof" tapeare disposed around the coilf turns I64 "and 161i. The repulsive force between the correspdnding coilturns lmand llZis' stillj srnalle'r'than the repulsive for ce that exists be;

twer'ithe coil turns 54% and lit for the given condition." Therefore, fewer turns lid of tape are disposed around the coil turns are and 112 turns i B-lgand;

than'are disposed around the coil 55.

"Although the tape means 553, has only been described as being; disposed around the corre-" 554-bit;

completejprotectionfor'the reactor 35, Whether simultaneousfaults occur at the points 45 and ATorfseparate mums at the points 48' or "49, as shown in Fig.2, the tape mean'slil' of the Fig. 5 embodiment can be combined with the tape means H6 andl5l! of the Fig. 6 embodimentj In particular/the t'ape means ll!" of the Fig. 5 embodiment could be disposed between the vertical 'tape n'ieansllfij'ar'id EEG, or turns of tape could be disposed around those coil turns shown 111' 'F1g fi6 that have'no tape disposed thereon, the tape being' applied in the same manner as inFig."5, so as to prevent the physical separa tion'of the coil section'sBZ and 3B.

The means'hereinbeffore described for preventing the phy'sioal separation of the coil sec-- tions'l2. andlB of 'Fig'l3 when a magnetic repulsive force of large magnitude exists there between has several advantages. For instance; the tape means 10 does not add to the physical size of' the reactor "IQ. In addition, the tape means lllis so distributed amongthe various coil turns comprising the coil sections 12 and 3 that a' minimum or tape is utilized in preventing thephysical' separation of the coil sectiol'ls I2 and l3i'when they are subjected to a high magnitude repulsiveforce. corresponding advantages likewise apply to the embodi' llhihi l tra sits q stitute. practical cmof thej'adially spaced cleat members;

bodiments of my invention, I do not limit myself to the exact details shown, since the modifications of the same may be considerably varied without departing from the spirit of the invention as defined in the appended claims.

I claim as my invention:

1. In a reactor, the combination comprising, a reactor coil having a plurality of coil sections, means for normally supporting the coil sec tions in horizontal and vertical spaced relation so as to produce a plurality of vertically and horizontally spaced coil turns, and flexible tieing means disposed for preventing the physical separation of the coil sections when fault current flows therethrough so as to establish a high magnetic repulsive force between at least two of the coil sections, said flexible tieing means comprising a flexible tie of an insulating material disposed around two vertically spaced cooperative coil turns of two said coil sections each of which coil sections has disposed therein one of the cooperative coil turns so as to prevent the cooperative coil turns and said two coil sections from being vertically separated when a high magnetic repulsive force is established therebetween, and another flexible tie of an insulating material disposed around the two coil turns disposed above and below said cooperative coil turns so as to hold them rigidly in vertical spaced relation when fault current flows simultaneously through said two coil sections.

2. In a reactor, the combination comprising, a reactor coil comprising three coil sections, means for normally supporting the three coil sections in horizontal and vertical spaced relation so as to produce a plurality of vertically and horizontally spaced coil turns, and tape means disposed for preventing the physical separation of the outer two coil sections when fault current flows simultaneously through said outer two coil sections thus establishing a high magnetic repulsive force therebetween, said tape means comprising tape disposed around two centrally located coil turns of said two outer coil sections, the two coil turns being vertically spaced above and below one another, one of the two centrally located coil turns being disposed in one of the two outer coil sections and the other of the two centrally located coil turns being disposed in the other of the two outer coil sections, and tape disposed around the two coil turns disposed above and below the two centrally located coil turns, the tape means cooperating to hold the taped coil turns rigidly in vertical spaced relation when a high magnetic repulsive force exists therebetween.

3. In a reactor, the combination comprising, a reactor coil comprising two coil sections, means for normally supporting the coil sections in horizontal and vertical spaced relation so as to produce a plurality of vertically and horizontally spaced coil turns, and tape means for preventing the physical separation of the coil sections when fault current flows simultaneously therethrough so as to establish a high magnetic repulsive force therebetween, said tape means comprising a plurality of layers of tape disposed around two of the adjacent centrally located vertically spaced coil turns of the two coil sections so as to prevent them from being vertically separated, one of said vertically spaced coil turns being disposed in one of the coil sections and the other of said vertically spaced coil turns being disposed in the other of the two coil sections, and a fewer number of turns of tape disposed around the coil turns disposed above and below the two centrally located coil turns so as to hold them rigidly in vertical spaced relation when a high magnetic repulsive force exists therebetween.

4. In a reactor, the combination comprising, a reactor coil comprising three coil sections, means for normally supporting the three coil sections in horizontal and vertical spaced relation so as to produce a plurality of vertically and horizontally spaced coil turns, and tape means for preventing the physical separation of the outer two coil sections when fault current flows simultaneously through said outer two coil sections so as to establish a high magnetic repulsive force therebetween, said tape means comprising a plurality of layers of tape disposed around two centrally located coil turns of said outer two coil sections which are vertically spaced above and below one another, one of the two centrally located coil turns being disposed in one of the two outer coil sections and the other of the two centrally located coil turns being disposed in the other of the two outer coil sections, and a fewer number of turns of tape disposed around the two coil turns disposed above and below the two centrally located coil turns.

5. In a reactor, the combination comprising, a reactor coil comprising two coil sections, means for normally supporting the coil sections in horizontal and vertical spaced relation so as to produce a plurality of vertically and horizontally spaced coil turns, and tape means for preventing the physical separation of the coil sections when fault current flows simultaneously through both coil sections so as to establish a high magnetic repulsive force therebetween,

, said tape means comprising a plurality of turns of tape formed from glass fibers disposed around two adjacent centrally located vertically spaced coil turns so as to prevent them from being vertically separated when a high magnetic repulsive force exists between the coil sections, one of said vertically spaced coil turns being disposed in one of the coil sections and the other of said vertically spaced coil turns being disposed in the other of the two coil sections, and a fewer number of turns of tape formed from glass fibers disposed around the two coil turns disposed above and below the two centrally located coil turns so as to hold them rigidly in vertical spaced relation when a high magnetic repulsive force exists therebetween.

Name Date Sauer Jan. 7, 1941 Number 

